A quick response to John Womack's query: The best places to search for production theory are (1) in the areas of location theory and the role that distance from a central attractor plays in the pricing of locational assets (Georgist economics if you please), (2) in the study of agglomeration economies and industrial districts there is a wealth of information about patterns of production and scale economies, and last but not least, (3) when understanding the problem of open-access production situation a/k/a the "tragedy of the commons" a clear distinction needs to be made between diminishing returns and negative returns and how and why property rights arrangement encourage one result rather than another. I might add also (4) the fledgling field of economic sociology where the idea that social networks constitute also a sort of social capital that aid production is being developed with ferocious speed by graduate students who understand the basic neoclassical framework. If this isn't a wonderful fruit-basket of ideas about production theory, then I do not know what is. I am sure there are other areas in economics broadly defined where production theory is discussed as well but here are some spontaneous responses to the question asked. I know that John Womack is interested in the role technological ideas play in economics. I think that there is now a general consensus that engineers cannot really solve many "economic" problems because economic problems are about choosing and ranking priorities. Engineering provides only one part and perhaps a tiny part of what we understand to be the economic calculation problem in economics. Laurence Moss